Tie between Uncharted 2 and 3

Why?

It's amazing

PS3 was my first Sony console. So, i would put these three at the top.

The Last of Us, Uncharted 2 & Shadow of the Colossus. As to why, the easiest one to explain is Uncharted 2. People often say playing a movie as a negative thing but Uncharted i feel is that does it right. I mean if you are willing to give such games a chance. It was such a joy to experience an Indiana Jones esque adventure.

The other two are quite hard to explain to someone who hasn't played them and even to those who have. People experience different things playing games, some would be okay just killing everything that moves and not reflect deeper on the themes presented. As for me, both of them touched me on an emotional level and the gameplay was excellent too, along with the sublime narrative.

Edit: I'll add Journey too since i already mentioned more games than it was asked.  

Shadow of the Collosus, the God of War games

Syphon Filter

God of War.

I love their take on the mythology. The art direction, story and decent gameplay all work together to make a truly unforgettable experience for me.

Well, the last one was a bit of a let down, but still it manages to be better than most games.

shadow of the colossus best sony exclusive the soundtrack the bosses it was just such and epic experience

Syphon Filter. The first two games literally had me glued to my seat and I would game for HOURS. It's just a shame it had to die with the transition to PS2.

I'm going to go with Ico. It expanded my idea of what a video-game could be. Even though they are completely different, I often compare it to Serial Experiments Lain, which showed me the vast amount of potential animation had beyond simple comedy and action. As an experience, Ico owned me from start to finish and then quite awhile after that.

Crash Team Racing. I played it for countless hours and always had a blast. It was great because you could have a lot of fun playing it alone and when you have friends over. IMO the best kart racer of all time. Though it partially might be because I just enjoyed Kart Racers more as a little kid. Still some of my most fond gaming memories come from this game.

No Sony franchise floors me like a must-have, but in average its the first party that has the most games that appeal to me.

If i had to say one: God of war. I like historical and mythological settings.

M favorite is Ghost of sparta, then Ascention and the chains of olympus. For some reason i dont enjoy the trilogy as much as the spin offs. It might be cause they got contained storylines instead of breaking it in 3 and milking it.